Arizona Drivers License Practice Test

An RTD (Resistance Temperature Detector) measures temperature by relying on the fact that:

Two dissimilar metals generate a voltage when heated The electrical resistance of a metal changes with temperature Gases expand uniformly when heated Infrared radiation intensity increases with temperature

Correct Answer:

The electrical resistance of a metal changes with temperature

Explanation:

An RTD uses a pure metal (like platinum) whose electrical resistance predictably increases as the temperature increases.

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